Metallocenes as catalysts in the preparation of cycloolefin copolymers

US5990254A · kind A · utility

Assignee

• Targor GmbH · DE

Inventors

• Thomas Weller · Mainz, DE
• Michael Aulbach · Hofheim, DE
• Frank Kuber · Oberursel, DE
• Gerhard Erker · Münster, DE
• Christian Psiorz · Essen, DE
• Bernd Bachmann · Eppstein, DE
• Frank Osan · Kelkheim, DE

Key dates

• Filing date: Dec 26, 1996
• Grant date: Nov 23, 1999
• Expiry date: Dec 26, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/943
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a stereorigid metallocene compound containing, as ligands, at least two substituted or unsubstituted cyclopentadienyl groups which are bonded to one another via a monocyclic or polycyclic ring system, where at least one cyclopentadienyl group is fused to the monocyclic or polycyclic ring system, and to a process for the preparation of a cycloolefin copolymer. The cycloolefin copolymers obtained in this way have high tear strengths and are suitable for the production of extrusion parts and injection moldings.